Contents

The party was founded the July 1951 by prominent center-left and leftist politicians, some of which were former members of ELAS. While, initially, EDA was meant to act as a substitute and political front of the banned Communist Party of Greece, it eventually acquired a voice of its own, rather pluralistic and moderate. This development was more clearly shown at the time of the 1968 split in the ranks of Communist Party of Greece, with almost all former members of EDA joining the faction with Euro-communist, moderate tendencies.

EDA participated in all the elections in Greece from 1952 until 1964. In the elections of 1958 it managed to become the leading party of the opposition, an achievement all the more surprising in view of the recent end of the Greek civil war and the consequently prevailing anti-Left politics at the time.

In the elections of 1961 and 1964EDA indirectly supported the Center Union against the National Radical Union. In 1963, just before the upcoming elections, Greece entered a protracted period of political and social unrest, with the assassination of EDA's deputy, Gregoris Lambrakis, providing further inflammation. EDA and the Center Union accused prime minister Constantine Karamanlis and his party, the National Radical Union, for the murder, which resulted in more and, sometimes, violent manifestations. Constantine Karamanlis denounced his accusers, and warned that they contribute to the deterioration of political instability in the country. An independent judicial inquiry held under public prosecutor Christos Sartzetakis concluded that responsible for the assassination were far-right extremists who linked with rogue elements in the Greek security forces. However, no specific instructions from the ruling political leadership were identified, nor proven in the subsequent trial of the perpetrators.